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BIND 9.10 has preliminary support for DNS cookies (or source identity tokens), a proposed mechanism designed to allow lightweight transaction security between a querying party and a nameserver. An error in the BIND code implementing support for this optional feature permits a deliberately misconstructed packet containing multiple cookie options to cause named to terminate with an INSIST assertion failure in resolver.c if DNS cookie support is enabled in the server. Only servers with DNS cookie support enabled at build time can be affected by this defect; in servers which do not have DNS cookie support selected any cookies encountered will be ignored as unknown option types.

Impact:

Servers which are built with DNS cookie support enabled are vulnerable to denial of service if an attacker can cause them to receive and process a response that contains multiple cookie options.

Servers which do not have cookie support included are not at risk from this vulnerability.

When BIND 9.10 is built from ISC-supported source, cookie support is not selected by default. In order to be included it must be elected using the "--enable-sit" command-line argument when running the "configure" script in the top level source directory. Operators with affected servers can re-configure and re-build BIND without cookie support if they prefer not to upgrade to a release containing the fix. However, ISC-provided binary packages for Windows do have "--enable-sit" selected. Server operators using the Windows binary packages should upgrade to the corrected version.

Active exploits:

No known active exploits.

Solution: Re-configure and re-build BIND without enabling cookie support or upgrade to the patched release most closely related to your current version of BIND.

Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected. (For current information on which versions are actively supported, please see http://www.isc.org/downloads/).

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